The Sunreavers are a great sin’dorei guild to look into.
There’s also a guild faire on the 30th, where a good amount of guilds should show up and you can do a bit of shopping around!
WRA-H has no shortage of great guilds so be sure to take a look at the pinned thread for WrA Info and Directories. Some of the guild info may be a bit outdated but it’s a good start.